IMPAX SUPREME is a vacuum degassed chromium-nickel-molybdenum steel, manufactured to consistently high quality. It is ideally suited to the production of molds and dies for plastics processing. (Supercedes UHB IMPAX P20, Alloy Digest TS-326, October 1977.) This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: TS-497. Producer or source: Uddeholm Corporation.